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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb242c0083834dbdfb37586711526f91e0e06cf645d5f650f6b82661c7548f83' 
  AND token = 'evnIqB2JVgzOMTCpTHdAGigcq1o1GPuy3u7ST/k9vWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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