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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c32937b4b4a961481b4ebbbd100e6eb54c058cbd1b2aacecaa76a1ca6d9eef' 
  AND token = 'DBQDBusmxI6hZYSg4o37JFMk/bgeNJVMMFaPspwFGqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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