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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2960c65994bbaa3f12597c57120be1f047daf8098225543098d31dd28028b4' 
  AND token = '0sHXXjIL/kUEMwTM5QQC445LAdO0Y1RUBkanT8EdtMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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