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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9671d1778b150a4cd1d7fac60e6161728c90c5a64a552f669b011d1502719857' 
  AND token = 'oMVgUQYyq7zkmAw2HfU9dYVCZqWLEFo3Pwywd25WlX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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