SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e746e3080abf7cecc5907e49ff77469f2c3d615a3b58b72929643ad3a3236c5' 
  AND token = 'zLHyGej5a+z1a2DjhLifCc/nLGB/nZWH2TRgL8HIQ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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