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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11303b8019d12052c38207f93938b71b4c24b6cda8e959b0c3f7f4c80b18b2bb' 
  AND token = 'JdtqVxGbT9xX76lmqOVJWnPfAiN14PYMRUEr0Kj6cio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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