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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c215cb52a5d6197413f12d9e6f708b5e25c5018539c7ef8a3e299b5b538792' 
  AND token = 'dwTIMJtEUCHh1ZzhCY7DE3C8F0uJsPvh0vCkcoIUxH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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