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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93598d493c4d9401b6cf4f874ff2abbf3e0f15f082047d50d96bf389f8fd34df' 
  AND token = 'SKj72fKt6KDBXDoLse4mAMJhXUo+QOhpBHh+obYGOEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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