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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e786e9c8b9826e6e5993b2440c0aefcb1997a2fc0aba3741b1095d36cd2ed417' 
  AND token = 'B4IiYwm2iyNLi6NxGtml0aytL8j1qRNXWLeaSj3J3aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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