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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f6e144c6ca35a1611769af6d6b8b93bd026b5d0da7f626d54c9a97a6300cad' 
  AND token = 'mw6HRrPHN62ixq+8v6npk5xL4EaZivW/VaDy9BqKDEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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