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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79cdfd88cdcdf7352ce079ab25f4456d8ca7a79c20d9ec0c22f919294eb5e58' 
  AND token = 'Tp5I6IiK84iMtBkUGefYx0ZlJjar/sIm7jlg8xOrk+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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