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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34539ffdc92ce85e13d1c144c277d1b7afbdfa9a56824864690b8a9d50b4df6' 
  AND token = 'dFUjJggnbse8seLy1B8son1VN1U/GO8rW/8Dqu4qAlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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