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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e014a7f01d675d223c42059059616ccc7946bd4e17a6b79c03924985d73953' 
  AND token = 'u8BU3gVHy47CVKBvC003/wyyc+ocwmLU9RskLw6GNNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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