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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5ecb9bfe2f8816ee8be7c26aab7bbc889a234f9a671c2b845d705bd1cd4a20' 
  AND token = 'He5xNXge2ARdLdRrkK7B/UtX6zaXELxaWhKWhxrr2bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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