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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ad5b0a2fb0d1fa530ba11ad89ec0dbba801b209c2f5fc7d78ca8ab4e8b6c91' 
  AND token = 'nPAJAOQhGvn8BmuZ9J4PYEoNQ1bAbJf83vsKJWQAlnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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