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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb08777c251e0d4f38445fb3592114180a7fcd537c518ac0a249a34bd6bd5ac' 
  AND token = 'g6SwKvcz4Lx7Ed2hB+dBdKxE4hwTy1lvWKWZhJbRDCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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