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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13599da791ad9a413f5aa0c255d6c9feeb94936b0a8d765e7b0e6da26c250396' 
  AND token = 'qSsFp16pyvqQkZNDFVPqU41UMs+UoWrmaNdybdVVhLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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