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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e228d722b5fed6fd114f88cc0246d2693d70629a87c9a0b951c6b45a001498a9' 
  AND token = '+ch7OEhU3pt6VfmHVjqfHn622jy1f1P3s+UqFIfF/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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