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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd662491af4b33ca0d0cda15164ccd8bb60f2ebc987cb756530bf09ee5a6b262f' 
  AND token = 'r98VMcXQIIz/RuNDFX327j1yXaQHbcgvt/Ynx7L0OZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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