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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4075723075bdfa44f37acbadf8e6616e990b0ac41abbfbaffc5b8e80d169d8fa' 
  AND token = 'M4YIAhPpzNmhg7A3yJ/unWOewp4LJaZUKEpbr74Xhbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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