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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89511b3227adc1e2cf87b579ad8a122569eb517267bf08bc5da4244611b8bb6b' 
  AND token = 'qPILfSnLbBjZowblWsDwSAoRwgYiFCP0nMtozRa5n9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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