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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3663e95ff2f4bc72d30baccaf028058af8209ac23fe9fb928c5c2accaa99a95e' 
  AND token = 'CZnG5456XsxToI4875E8RSIpkKxDZKpAI9+VYvWCKmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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