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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7938ebb31f5a487d40e34b01e31d06eac4bfe19705cfc9c1e4cd176ac348da3a' 
  AND token = 'NKVey2TxYC0UzaDp5LA2hw9BrE6AaDAM7HIrAbmuc4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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