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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb14d124a140442a4a1baf1a48bc666e2658885799c14bf6988b0a804f339ae' 
  AND token = 'M+Rhe8qe1e6I+3CvOEoweymqY8oKtHXmL+0BCZz6y6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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