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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c9d958e912b5a41bd295bc90aed0168b7d2afa0f49ed76acb6214543b52b06' 
  AND token = '+n4ujI58+okrZAJms2c29+MrDVyZD1qUeqB14l8k2y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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