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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06807a3d66a3db7604a6c60918d9df5b990225d2fdef2f228eecd37f9e63f355' 
  AND token = 'oT6A2fITGV89DgY36DHhe7qQhYrogSvZokZ+TS1l95M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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