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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbef911d3117cfa617eb217c010528428b974582c9314565396fc5bf25d99754' 
  AND token = '36roj1z1eGeV8W5awelz6dE05Xb3+8CCMHrGE9yfjEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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