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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eab230c15ece96b944e08300a590c01e5d33d42737d1aeb291ebc31a0d6a788' 
  AND token = 'NQoWcIrz8v7O6TyQagjBqacJ6JDyw8tGKYgJMxwMYfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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