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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fc6e6d9e79dfe7bd09bb16d453a0c080b0ebc677a449ca83c92906028d71b3' 
  AND token = 'vxA4z9w/kpDQW7yA4EGbVTVIcykuimuo3aoppt1A8kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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