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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb119222730e14c3802ed52110082dde0b64b8f17fae00ae772eca2a921cc5f0' 
  AND token = 'pvq8ntyGo74uRJtO84QOCPJINySN4Y5IRgkbe1EcvIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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