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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e1c388f416455df415c6af953f986c6e63ac53195dbd76f4f334430bc6873b' 
  AND token = 'wCRKoZLDJMLEnYGSK4cv8zC3WMkg6WvM2GbV0s3bpjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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