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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ecc975e5c9db7fa3563e2df0febce0621c15d0edfa8a1e44541ebc695dbee8' 
  AND token = '8l/9i9GxLGDIe2hWNDQBnTZjJeFjOb8D5modD0cFrGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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