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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8a54c378d2e717507fa35d7adffbb6f2a351061f7e944a48bb8b4612fa7df5' 
  AND token = 'terFsQbbeq7bZlwTRtFioR84zv1y8+T2yRKF4YLFhxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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