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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fe00b4af39ca4ab16d0dff00e06f395616f0fb89df7f1a9f1f4f142dbd6b0c' 
  AND token = 'XK8IhyZaNt8Gf57zUptNJgBmXhkO0B3qCmFgogWZE6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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