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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c352323e099f90ebb3280a4eaf3473028e9222bfd4c0f74947864d1eee7f095' 
  AND token = 'lK1ran+gZmP+LJTdo3e8ARU+7v222k04VzG9MfNHBFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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