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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fd45c01437e042a779619fcde0de8cf914b62c63194867e5954736271810ff' 
  AND token = 'Z3VxK88na22iZeaE7YIO44du+ReWGwAw1X8sVtBzt18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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