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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0714490d46949462a51e38f716e334d9b980c0fc714bb29088baaa1d5780eb39' 
  AND token = 'IX946DPlxVHUff4TR0T4z8WJ4J0sALL/SNevAqWUEtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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