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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93435ded376ddd5672635e9ebdf52e6960b0874888105b4c85945e265d2ec34d' 
  AND token = 'WfSx5KNjJ6rP8/xnS3Ikk3OoGfRo6uH7D4RNbocUQ4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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