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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607690dbe8b53ec51f9bd76a45cd80d459441826c7f1b1e2716adbeed5c225db' 
  AND token = 'Ha30YZEmCArsAmw0eT0sqRYWQ527XoBvL4L1H9roRkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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