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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2a11485f97381ff0da9a2146b82ca775f852134f5dcb0c340704710c788895' 
  AND token = '9898E295qVb99UPQkA5sncbX9DyIYuQh0crZ+qqnJsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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