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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178cf51a25e2c59e9443e4bf451b183fb1f3fc88ec0c48012c6a7ddf26fba008' 
  AND token = 'KdnCoFQPPGNT/iyX5esHTMRIN09d9KrTcwhUqlQC8KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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