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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc764d2eaf8df49b839ee0ac17a020babccf4902c54ca98cecf3fa2aa02f16bc' 
  AND token = 'Taap85xkfEPzIdn7/4Br3Y8OQlSuz2I8AZSWBA4r5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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