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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2730594799b7f3fe19386ef45fa50a361d8b0beeec6eca0594f65c8950188698' 
  AND token = 'kykWai6hoIVthgnqIj+BJvMNWKXnoW6YTcf5dslWUBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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