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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0985bca91fd505fdebd9e89162793d61b4e95c99161544f35ae693c530e3d7b' 
  AND token = 'xKciWEdVFbDs8j0SG/sjtbFNh5OeWgi9/9rf/RLf5+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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