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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1e54ea299a4fcbd1bfa9c4190ef1783f068a6ca9b0b1d8788cf9242b608037' 
  AND token = 'Ji9jzy8UVWuGbf/sr7NSCzElLjRkaS8Ncarl1bAySUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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