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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76496ac8275a8d88bda586492797e5a5ce4a827b31e1e1b4aae30cbdc91a33f7' 
  AND token = 'dzUDv21FH8gU9wx1lfWqSq2/liAoYxSxhSjE0Y8ojfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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