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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d9b69e6694e00adbd298a343eb06aeb9b326e5c65b76c00bd594eabdacbac4' 
  AND token = 'WLBpWqT3RRfIfMiB8iAM8sSXAShAbcXlUZTeRnX55+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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