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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f37f402d8cb1b3ab9c552f1abefa78a93978a0ccb5d98625bf8e79651ee2b2' 
  AND token = 'esjpzYDOQyeKwaUmdXo40or5gsZrlkLpdqYTUEyUO28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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