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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb213f42168d17a9877d43bf7b8a9b21d53307a99443081c1169f9524651c92f' 
  AND token = 'Rv63rBQ/0CQSMzPQ0C38pQ7YgoXEPOkB7D7ft6wACm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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