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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ce92db00eaf7662ca464b013a97420e56cb44053ccbc7de9dc85d29a1746e5' 
  AND token = '+FCeIZDq/+eD0aNJ5LPX+eyeRCfJ1pTk5s6vhp8m4oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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