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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a97dbefff39207bb0087697211cfef772c34d3f1e0082ff7656cad1d1ca6a4' 
  AND token = '+ut7Z9KZLxWC6hWU6AUIoHdcH8BA9P6GW8582RnfdFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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