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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c2bcb9fad67f8ccd8ef8a9c0bb131112f6b9da3beaf5c819515a87e6b36af9' 
  AND token = 'M82GzPDKBt/Xnp2sNjsIEjtcmW2uu3YlzYZIKzpFF+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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