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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdaee42d7320bade61a59d77fc2990ad31640afb1a42804c5832f76d017a108' 
  AND token = 'vEXKUWV1dQKpULTn+cHRM/eYYNgxHefFHQUBEMScFSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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