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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c931b1bbad95600a50551aa7ec359f3b768d0db83a21d4bede2ff9ae749eb13' 
  AND token = 'I6oF0Du8+r/2HWhsNwK9WKjTnYCz+2ifoP5fGw3+xOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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