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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac75ecefe093404040bb0bd1b3b84af42e8059f5259584b526059bd0dd287c1' 
  AND token = '005H9ZN4+ft3HtW/QsJaqgyYipbhatscpJlLPDkrYyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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