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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818ee5a6a3b25ead4a38e89875b348c5a42634ebb719873cdd6131c63942d17d' 
  AND token = 'pT1xY79XaTZrne80m2smdzGlFk/ptqQ7MFb5/bFTOqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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