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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0079b60e904008fa5878732f50c018d430008c5348aa13e0cf17f9a40d64e2' 
  AND token = '93mCjOyppXlWn1QGNNFsR6X5bRVu7ZPXkt7rV1nhPmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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