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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fb1f3b15294f7322c1c7ce31345df2e1350dd8fa0dc6be4a24596a507ab252' 
  AND token = '1FgczJEUjgsvBUlqy6TW9aQe8mXGJNUMkAX1XmG4zU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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