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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888d956adda87ced3be3d452c69deeae1eb3d5799ea7a5bb5e24b64a2d613eef' 
  AND token = 'baCBWzjNMTk0RAHcNRhElDH6YzyPv8boe/0ZVHHJsi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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