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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0c35433472d8f65646d842f91e91781e64b8cf1723c66affc250b939da373e' 
  AND token = 'DwOmZsO1+yHbN1rySDAnPyl31Ii1TFBaJR8YRkyQ3So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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