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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045c32ce15ff652eb575b67857c8b73fd5d08eed489b28ad09f702bec96d086f' 
  AND token = 'UyMx+wObYdN+fC/+SnYPZe0e5tCyD0q2G3S6cRvBTFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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