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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6160453f6a12e344e6b584c2e0a22bd79adc58fb4188249c9bd1ccb9855f1fb6' 
  AND token = 'bLMhCCW5B3Hvvl0f99MW9u45cJi3oyYV2I6jvG5eOvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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