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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329bba84910ef9c5ac2506f54244e7c39621f4f74f860f67afc60f81eadfc00f' 
  AND token = '/MnHj6StQfGN/+vVHHCGrOnxsOdz6ZKsafTr+vVBIoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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