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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94396be1f484254f9c91424af79146c591f67a8a02ae93b9b8a21dcf624870f9' 
  AND token = '0HB6P5R/lz2iyKvQWwYIw2fHFFpm8mT+SrsDdIT1ui0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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