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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1977ccb8f7d6264a32515756d86229dea1ce15818c3f10b2748fecbbdb7f506' 
  AND token = 'TKXnInHG32uo97KQJVgSPFE6MeNvphpRmxaF0gtBt6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}